Hex Mayflies
Hexagenia limbata
The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.
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This one was surprisingly straightforward to identify. The lack of a sclerite at the base of the lateral hump narrows the field quite a bit, and the other options followed fairly obvious characteristics to Clostoeca, which only has one species, Clostoeca disjuncta.
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This one got a little bit damaged in the abdomen when I extracted it from its case. That's a delicate job.
DMM
Posts: 34
Posts: 34
DMM on May 18, 2007May 18th, 2007, 4:42 pm EDT
It may be Lepidostoma. It appears to be lacking a dorsal hump, and the genus is quite large. The cases can be highly variable and can be made of sand or organic materials.
David
Creno on Dec 22, 2007December 22nd, 2007, 10:26 am EST
the case and legs support your conclusion that this is lepidostomatid. A limnephilid would have a different arrangement of the setae/spines on the legs.